Pipe-wrench



(No Model.) E A. ROBBINS.

PIPE WRENGH.-

Patented Dea 19, 1882.

WTNEEEIEE;

UNrTsn STATES PATENT ()liFlCEt EDWIN A. ROBBINS, OF BOSTON, MASSACHUSETTS.

PIPE-WRENCH.

SPECIFICATION forming part of Letters Patent No. 269,234, dated December 19, 1882. Application filed October 2, 1882. (No model.)

To all whom it may concern:

Be it known that I, EDWIN A. RoBBrNs, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Pipe-Wrenches, of which the following is a specification.

The objectof my invention is toprovide a cheap, simple, convenient, and durable pipewrench, which shall overcome the objections to those heretofore constructed; and it consists in the construction, combination, and arrangement ofthe several parts of the wrench, as hereinafter more fully described and set forth in the claims.

Figure 1 represents a perspective view of a pipe-wrench constructed according to my invention. Fig. 2 represents a side elevation of the same, with the jaws and handle in position to be applied to a piece of pipe. Fig. 3 represents a sectional elevation of the same, showing position ofjaws and handle when power is applied thereto. 7

A represents the handle of the wrench, secured to the rear end of the lever-bar B, the opposite end of which is pivoted to the fore part or bar 0 by a fulcrum-pin, D, passing through the same, the said bar 0 being provided with ahousing, E, at its rear jointed end and a serrated jaw, F, at its opposite or forward end.

H represents the adjustable jaw, provided with a housing, K, which fits upon the bar 0 of the fore part, and from the rear part of the serrated adjustable jaw 0 extends a screwthreaded shank, L, which is provided with an adjusting screw-threaded nut, P, having a circumferential groove, R, within which tits the hook S, formed on the forward end of the said lever-bar B, and very nearly opposite the fulcrum-pin D, which pivots the lever-bar B to the said jaw-bar 0, whereby great power is brought to bear upon the adjusting-nut P, so as to force the adjustable jaw H against the pipe, about whichthejaws F H are placed when the handle is in the position shown in Fig. 2. Now, power being given the handle A in the proper or forward direction, the serrations or teeth upon the inner faces of the said jaws are forced into the surface of the pipe about being turned until the said adjusting-nut P is brought against the face of the shoulder T, formed upon the join'teud of the pivoted bar 0 near its housing K, and the bevel N of the handle leverbar B against the corresponding bevel V, formed upon the rear end portion of the pivoted bar 0, and the said lever-bar B against the screw threaded portion L of the said shank of the adjustable jaw H, all of which parts come together at the same time, so as to form a rigid stop, whereby the said jaws are prevented from approaching each other; or, rather, the adjustable jaw at this point comes to afixed stop, as shown in Fig. 3, so as to prevent injury to the pipe, as would frequently result were not stop provisions made, but the adjustable jaw permitted to force itself or to be forced toward the stationaryjaw by the power exerted thereon (as in pipewrenches heretofore) until the pipe is crushed. This construction also allows or causes the adjustable jaw to recede when the handle is brought back into the position shown in Fig. 2, thus relieving the hold of the teeth of the jaws upon the pipe expeditiously. Thus the jaws are caused to hold with sufficient grip to turn the pipe, and are prevented from injuring the same by undue pressure thereon.

It will be seen in Fig. 3 that the pivoted lever-barB has a shoulder, U, adjoining or near its hook S, which contacts with the rear face of the said adjusting-nut P, so as to force the same forward, thus carrying the adjustable jaw toward the other, and that the said hook S is more especially designed to draw the said nut and jaw back or in the opposite direction.

The essential features of my invention consist of the pivoted lever-bar and adjustingnut, of the the novel construction whereby the grip is governed or predetermined by the movement of the adjustable jaw and rigid stops above described.

Having thus described my claim- 1. The combination, with the stationaryjaw F, having bar (3, adjustable jaw H, having screw-threaded shank L, and adjusting-nut P, of the fulcrumed lever-handle connected with the periphery of the said adjusting-nut,

invention, I

so as to actuate the said adjustable jaw toprovided with the hook b and shoulder U, and Ward and from the stationary jaw by movestops, substantially as described, as and for ment of said handle, substantially as dethe purposes set forth.

scribed, as and for the purposes set forth. EDWIh A. ROBBINS.

2. The combination, with the stationary jaw Witnesses:

F, bar 0, adjustablejaw H, shank L, and arl- SYLVENUs WALKER,

justing-nut P, of the fulcrumed 1ever-bar B, A. E. LEAVIT'L. 

